SSL Cerificate using LetsEncrypt and DDNS

I’ve the following use case:

  • I’m using NethServer release 6.10 on an old DELL Dimension 5150. And even if it’s an old slow machine, I was and still be quite happy :slight_smile: with Nethserver and its functionality. Now I want to host my own Web Site at home and did the following.

  • I registered my domain

  • I’m using for DDNS

  • On my router I’ve done port (80,443) forwarding to my nethserver device where I’ve installed wordpress.

  • Everything works fine BUT the browsers (Firefox, Chrome and Edge) give me e security exception.

  • Firefox gives me the Error code: MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT

  • So far understandable. Then I used LetsEncrypt (according to to created a valid Cerificate on my maschine. Everything worked fine but still the same security issue by the browsers (MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT).

Any help or hints to solve this problem would be very nice and helpful.

Thanks in advance and Kind Regards – René Siegenthaler | Switzerland

This is my Firefox’s error message when connecting to your web site: uses an invalid security certificate. 
The certificate is not trusted because it is self-signed. 
The certificate is only valid for . 


Did you set additional host names for the certificate (SAN)?

Please refer to: